JPS5819956Y2 - wiper drive device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wiper drive device used in automobiles, etc., and includes a switch device that automatically controls the reversal drive of the motor in the wiper device in which the wiper blade is reciprocated by reversing the motor. It provides:

As a wiper drive device for automobiles, etc., instead of the conventional method in which the wiper motor and the wiper blade are connected by a link mechanism and the wiper blade is reciprocated within a predetermined rotation angle range by the wiper motor's unidirectional rotation, the link mechanism is used. A method has been developed in which the wiper blade is reciprocated by forward and reverse rotation of the wiper motor itself (see Japanese Utility Model Publication No. 52-48522).

Since this new method can omit the link mechanism, it not only makes the wiper device more compact, but also has advantages in terms of installation space, installation work, power transmission function, and cost.
It has many advantages such as the ability to increase the reciprocating rotation angle of the wiper blade.

However, on the other hand, the forward/reverse switching control mechanism of the wiper motor is quite complicated, and in addition to the switching control mechanism, it is necessary to incorporate a so-called auto-stop mechanism that stops the wiper blade when it reaches a predetermined storage position. The problem is how small and compact it can be.

The present invention provides a switch mechanism for controlling various types of wiper motors as described above, and will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a wiper motor, 2 is a pinion gear attached to the rotating shaft of the wiper motor 1, and 3 is a worm wheel integrated with the wiper drive shaft 4. When the wiper motor 1 rotates, the worm wheel is connected to the wiper motor 1 via the pinion gear 2. 3 rotates at a reduced speed, and a wiper blade (not shown) attached to a wiper drive shaft 4 is rotationally driven.

Reference numeral 5 denotes a switch section attached to the gear case 6 so as to face one surface of the worm wheel 3, and the switch section 5 is supported by a slider 51 as shown in FIG. movable contacts A, B that can move within a predetermined range in the circumferential direction, and fixed contacts a1. a2. a
3゜bLb2. b3 is between al and 33 at one end of the predetermined movable range in the circumferential direction of the movable contacts A and H, bl and b3
The insulating plate 52 is further provided with a contact point C.
, D are fixed.

53 indicates a switch box.

On the other hand, the worm wheel 3 is made of an insulator, and on the surface of the worm wheel 3 facing the switch part 5, a guide groove 31 into which an engaging part 51' formed on the slider 51 of the switch part 5 is fitted is formed so that the worm wheel 3 rotates for a predetermined amount of rotation. angular range (approximately 180 in the illustrated embodiment)
a sliding plate C made of a conductor, which is provided in an arc shape over a range of 10° to 100°, and in which the contacts C and D of the switch part 5 are in sliding contact and closed in a section excluding one end of the predetermined rotation angle range;
A ground contact d is provided near one end of the predetermined rotation angle range, with one contact being contacted.

These contacts C, D, sliding plate C, and ground contact d are for auto-stop, which will be described later.

The electrical connection relationship of each of the above-mentioned contacts is as shown in FIG.

That is, the fixed contacts a1, b2 and al, bl are connected to one terminal and the other terminal of the wiper motor 1, respectively, a3 is connected to the power source E via the wiper switch W, and b3 is connected to ground. ing.

The contact C is connected to the power source E via the ignition switch (2), and the contact D is connected to the fixed contact a3 via the wiper switch W only when the wiper switch W is off.

The operation in the above configuration is shown in the circuit diagram in Figure 3 and in Figure 4, I9.
To explain sequentially in (a) and (c), when the wiper motor 1 is not operating, the 4th wiper motor is
It is in the state shown in Figure A.

When the wiper switch W is turned on from this state, the third
In the figure, power supplies E, W1. W2. a3. A, a1゜The circuit from wiper motor 1, bl, B, b3 to ground is closed, wiper motor 1 is driven to rotate in one direction, and worm wheel 3 is rotated clockwise in Fig. 4 (this direction of rotation is referred to as forward rotation). ).

In this case, even if the worm wheel 3 rotates, the engaging portion 51' of the slider 51 only relatively changes the position where it fits into the guide groove 31, but the slider 51 itself does not move. As shown, movable contacts A and B still maintain the same state as A.

When the worm wheel 3 rotates approximately 1800 times, the slider 51
The engaging portion 51' is in contact with one end P of the guide groove 31,
As the worm wheel 3 rotates, it is pushed and slid in the direction of rotation, and as shown in FIG.
Contact s b 2.

Then, the direction of the current flowing through the wiper motor 1 is reversed in FIG. 3, and the wiper motor 1 rotates in the reverse direction, and the worm wheel 3 reverses in the counterclockwise direction in FIG. 4.

Then, at a position where the worm wheel 3 is rotated 180 degrees in the opposite direction, the engaging portion 51' of the slider 51 is aligned with the guide groove 31.
The movable contacts A and B come into contact with < alsbl as shown in FIG.

By repeating such operations, the wiper blade rotates back and forth within a predetermined angle range.

Next, the auto-stop mechanism will be explained.

When the wiper switch W is turned off at any position during wiper operation, such as the opening position in Figure 4, the off contact W1/ of the wiper switch is connected to W2/ in Figure 3, and the ignition switch 1, contact C1, sliding plate c1 Contact, W1
33 is still connected to the power source E via / and W2/, and the wiper motor 1 continues to rotate.

When the state shown in FIG. 4C is reversed and the state shown in FIG.

In this case, a 1 , A , a 3 , W2', Wl
',D.

d t b 3 s B , b 1, wiper motor 1
A closed circuit is formed, and the electricity generated by the inertia of the motor is short-circuited and acts as a brake.

As described above, according to the present invention, there is provided a switch unit including a movable contact supported by a slider, a fixed contact switched by the slider, and an auto-return contact, and a worm that transmits the rotation of the wiper motor to the wiper blade. The simple combination structure of the guide groove of the slider provided on one side of the wheel, the auto-return sliding plate, etc. allows the wiper motor to be switched between forward and reverse directions accurately, and the wiper motor is always turned off when the wiper switch is turned off. It can also perform an auto-stop function that stops the wiper blade at a predetermined storage position.The wiper motor control mechanism is small, compact, and inexpensive, making it extremely effective. This is extremely important in contributing to the practical application of wiper devices using this method.

[Brief explanation of drawings]

The attached drawings show an embodiment of the present invention, in which Fig. 1 is a schematic sectional view of the wiper drive mechanism, Fig. 2 is a sectional view of the switch mechanism shown in Fig. 1, and Fig. 3 is one drive circuit of the wiper motor. Figures 4A, 4A, 9B, and 3C are diagrams showing the operating states of the switch mechanism in sequence, and Figures 4A, 9B, and 9C are diagrams in which the switch unit and the facing surfaces of the worm wheel facing it are compared in parallel. There is. 1... Wiper motor, 2... Pinion gear, 3... Worm wheel, 31...
... Guide groove, 4 ... Wiper drive shaft, 5.
...Switch section, 51...Slider, 51
'...Engaging part, 52...Insulating plate, A,
B-=-...Movable contact, a1, a2. a3.
b1. b 2゜b3...Fixed contact, C9D・
...Contact, C...Sliding plate, d...
・Earth contact, E...Power supply, W...Wiper switch, ■...Ignition switch.

Claims (1)

[Scope of utility model registration request] In a wiper device in which a wiper blade is reciprocated by forward/reverse switching drive of a wiper motor, a movable contact held by a slider and a worm wheel in a drive transmission mechanism of the wiper motor are provided. A switch section is provided, which includes a fixed contact that switches the movable contact by the sliding of the slider to reverse the wiper motor drive circuit, and two contacts for auto-stop, etc.
On the surface of the worm wheel facing the switch part,
A guide groove in which the slider of the switch part engages and presses and slides the slider in a direction to switch the wiper motor drive circuit at both ends of a predetermined rotation angle range of the worm wheel, and two for automatic stop of the switch part. The wiper drive is characterized by a sliding plate having two contacts in sliding contact, connecting the two contacts except at one end of the predetermined rotation angle range of the worm wheel, and continuing to energize the wiper motor even when the wiper switch is turned off. Device.